Echocardiography can be used to examine the following diseases: 1) congenital heart disease: such as ventricular septal defect, atrial septal defect, patent ductus arteriosus, pulmonary valve stenosis, endocardial cushion defect, tetralogy of Fallot, transposition of the great arteries, etc.; 2) valvular disease: such as congenital valvular disease, rheumatic heart disease, senile degenerative disease, infective endocarditis, etc.; 3) cardiomyopathy: including dilated cardiomyopathy, hypertrophic cardiomyopathy and systemic or cardiac diseases involving myocardial tissue, resulting in myocardial defects and dysfunction, such as hypertensive cardiomyopathy, ischemic cardiomyopathy, metabolic cardiomyopathy, inflammatory cardiomyopathy, alcoholic cardiomyopathy, etc.; 4, pericardial diseases: including pericardial effusion, pericardial tamponade, pericardial tumors, etc.; 5, large artery diseases: such as aortic coarctation, aortic constriction, etc.; 6 Echocardiography can be performed for diseases of the coronary arteries: such as myocardial infarction, coronary artery fistula, Kawasaki disease, and trauma to the chest. Echocardiography is a non-invasive technique that uses ultrasound technology to examine the structure and function of the heart. Patients with chest discomfort, chest pain, or suspected heart disease are all indications for echocardiography.